Post-holder’s minute trouble attracting particular interest (7)
I believe the answer is:
mailbag
'post-holder's' is the definition.
I can't tell whether this definition defines the answer.
'minute trouble attracting particular interest' is the wordplay.
'minute' becomes 'm' (abbreviation).
'trouble' becomes 'ail' (synonyms).
'attracting' means one lot of letters go next to another.
'particular interest' becomes 'bag' (I've seen this before. I am not sure about the 'particular' bit.).
'm'+'ail'+'bag'='MAILBAG'
Can you help me to learn more?
(Other definitions for mailbag that I've seen before include "One sewn by convicts" , "carrier" , "Sack for post" , "Sent down sewer's product" , "Post pouch" .)